This was over tweny years ago, but there was salesman I couldnt hang up on. They had some way of seizing the phone line. I complained immediately and firmly, reasoning that my phone could be considered a lifeline for emergency help. If some idiot was on the line and I couldnt hang up then I or someone else could be in serious trouble. Aside from that, I was paying for service on demand, and if some clod could take it away from me, then he should be in jail.